Clear Filters
Clear Filters

How do I obtain the bode plot of the given transfer function?

2 views (last 30 days)
Given the transfer function below, how can I graph it on Matlab to get the bode plot? provide code pls!

Answers (2)

Angelo Yeo
Angelo Yeo on 29 Nov 2023
Here is a simple example. You can further put your parameters in H.
s = tf('s');
H = (s+1)/(s^2+s+1);
bodeplot(H)
grid on; zoom on;
  2 Comments
bebo
bebo on 29 Nov 2023
Edited: Walter Roberson on 29 Nov 2023
This is the code I have so far I broke the equation into parts so it's easier to plug in but I'm still getting an error message.
% Parameters of the boost converter
Vin = 75; % Input voltage
Vout = 150; % Output voltage
L = 7.5e-5; % Inductance
C = 5.01e-4; % Capacitance
R = 30; % Load resistance
fs = 100000; % Switching frequency
D = 0.5; % Duty cycle
rC = .005; %ESR
rL = .1; %ESR
% Equation broken into parts
X = (Vout(R+2*rC))/(L*C(R+rC));
Y = (s+1)/(C(R/2+rC));
Z = (s^2+C(rL(R+rC)+R*rC(1-D)^2)+L)/(L*C(R+rC));
A = (s+(1-D)^2*R+rL)/(L*C(R+rC));
s = tf('s');
H = X(Y/Z*A);
bodeplot(H)
grid on; zoom on;
Walter Roberson
Walter Roberson on 29 Nov 2023
MATLAB does not have implied multiplication anywhere -- not even in the interal language of the moisture vaporators.
If you want multiplication, you need to use the .* or * operator.

Sign in to comment.


Sam Chak
Sam Chak on 29 Nov 2023
You need to improve your skills in identifying math operators. There are many missing '*' operators
% Parameters of the boost converter
Vin = 75; % Input voltage
Vout = 150; % Output voltage
L = 7.5e-5; % Inductance
C = 5.01e-4; % Capacitance
R = 30; % Load resistance
fs = 100000; % Switching frequency
D = 0.5; % Duty cycle
rC = .005; % ESR??
rL = .1; % ESR??
% Equation broken into parts
X = (Vout*(R+2*rC))/(L*C*(R+rC));
% ^ ^
s = tf('s');
Y = (s+1)/(C*(R/2+rC));
% ^
Z = (s^2+C*(rL*(R+rC)+R*rC*(1-D)^2)+L)/(L*C*(R+rC));
% ^ ^ ^ ^
A = (s+(1-D)^2*R+rL)/(L*C*(R+rC));
% ^
H = X*(Y/Z*A);
% ^
bodeplot(H)
% grid on; zoom on;

Categories

Find more on Electrical Block Libraries in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!